Organic light-emitting diode display

ABSTRACT

An organic light-emitting diode (OLED) display is disclosed. In one aspect, the display includes a plurality of pixels and a data line formed adjacent to the pixels and configured to transfer a data voltage. The display also includes a driving voltage line formed substantially parallel to the data line and configured to transfer a driving voltage, and an initialization voltage line formed substantially parallel to the data line and configured transfer an initialization voltage. At least one of the pixels includes a driving transistor including a driving gate electrode and configured to receive the initialization voltage from the initialization voltage line. A driving connector is spaced apart from the data line and electrically connected to the driving gate electrode. An OLED is electrically connected to the driving transistor, at least one of the initialization voltage line and the driving voltage line interposed between the driving connector and the data line.

INCORPORATION BY REFERENCE TO ANY PRIORITY APPLICATIONS

This application claims priority to and the benefit of Korean PatentApplication No. 10-2015-0060610 filed in the Korean IntellectualProperty Office on Apr. 29, 2015, the entire contents of which areincorporated herein by reference.

BACKGROUND

Field

The described technology generally relates to an organic light-emittingdiode display.

Description of the Related Technology

In an organic light-emitting diode (OLED), an electron is injected froma cathode electrode and a hole is injected from an anode electrode whichare coupled with each other in an organic emission layer to generate anexciton, thereby emitting light and energy from the exciton. Many ofthese electron and hole interactions result in the full light of apixel.

The OLED display includes a matrix of pixels each including a pluralityof transistors and capacitors for driving the OLED. The transistorstypically includes a switching transistor and a driving transistor.

The driving transistor controls a driving current flowing to the OLEDand stores a data voltage in a storage capacitor connected to a drivinggate node of the driving transistor to maintain the data voltage for oneframe. Accordingly, in the driving transistor during that one frame,light is emitted by supplying a predetermined amount of driving currentto the OLED.

However, due to a parasitic capacitance formed between a driving gatenode connected to a driving gate electrode of the driving transistor anda data line, a voltage change of the data line influences a voltage ofthe driving gate node. Vertical crosstalk in which a voltage change ofthe driving gate node changes driving current flowing in the OLED togenerate a luminance change occurs.

In order to prevent vertical crosstalk, the distance between the dataline and the driving gate node is made as large as possible, but in ahigh-resolution device, the size of the pixel is smaller. Thus, processdesign rules do not proportionally decrease due to equipmentspecifications and limitations of the photolithography process capacity.As a result, with increasing display resolutions requiring smaller andsmaller pixels, there is a limitation in minimizing the verticalcrosstalk.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the describedtechnology and therefore it may contain information that does notconstitute the prior art that is already known in this country to aperson of ordinary skill in the art.

SUMMARY OF CERTAIN INVENTIVE ASPECTS

One inventive aspect relates to an OLED display that can minimize avertical crosstalk in a high-resolution structure.

Another aspect is an OLED display including: a substrate; a plurality ofscan lines formed on the substrate and transferring scan signals; aplurality of data lines crossing the scan lines and transferring datavoltages; a driving voltage line crossing the scan lines andtransferring a driving voltage; an initialization voltage line crossingthe scan lines and transferring an initialization voltage; and aplurality of pixels formed at a plurality of points where the scan linesand the data lines cross each other, in which at least one pixel amongthe plurality of pixels includes a switching transistor connected to thescan line and the data line, a driving transistor connected to theswitching transistor and to which the initialization voltage is suppliedfrom the initialization voltage line, a driving connecting memberconnected to a driving gate electrode of the driving transistor, and anOLED electrically connected to the driving transistor, and the drivingconnecting member is spaced apart from the data line with any one of theinitialization voltage line and the driving voltage line therebetween.

The plurality of pixels may include a first pixel and a second pixeladjacent to the first pixel, the data lines may include a first dataline transferring a first data voltage to the first pixel and a seconddata line transferring a second data voltage to the second pixel, thefirst data line may be spaced apart from the driving connecting memberwith any one of the initialization voltage line and the driving voltageline therebetween, and the second data line may be spaced apart from thedriving connecting member of the first pixel with the other one of theinitialization voltage line and the driving voltage line therebetween.

The plurality of pixels may include a first pixel and a second pixelwhich emit light having different colors, and a third pixel disposedbetween the first pixel and second pixel, the driving voltage line maybe disposed between the first pixel and the third pixel, and theinitialization voltage line may be disposed between the second pixel andthe third pixel.

The data lines may include a first data line, a second data line, and athird data line transferring a first data signal, a second data signal,and a third data signal to the first pixel, the second pixel, and thethird pixel, respectively, the driving voltage line may be disposedbetween the driving connecting member of the third pixel and the thirddata line, and the initialization voltage line may be disposed betweenthe driving connecting member of the third pixel and the second dataline.

The OLED display may further include a fourth pixel emitting the samecolor light as the third pixel, in which the second pixel is disposedbetween the third pixel and the fourth pixel.

The data lines may include a first data line, a second data line, athird data line and a fourth data line which transfer a first datasignal, a second data signal, a third data signal, and a fourth datasignal to the first pixel, the second pixel, the third pixel, and thefourth pixel, respectively, the driving voltage lines may include afirst driving voltage line, a second driving voltage line, a thirddriving voltage line and a fourth driving voltage line which transferthe driving voltage to the first pixel, the second pixel, the thirdpixel, and the fourth pixel, the initialization voltage line may includea first initialization voltage line and a second initialization voltageline supplying the initialization voltage to the third pixel and thefourth pixel, the third driving voltage line is disposed between thedriving connecting member of the third pixel and the third data line,the first initialization voltage line may be disposed between thedriving connecting member of the third pixel and the second data line,and the third driving voltage line may be disposed between the drivingconnecting member of the fourth pixel and the fourth data line, and thedriving connecting member of the fourth pixel may be disposed betweenthe fourth driving voltage line and the second initialization voltageline.

The OLED display may further include a fourth pixel emitting the samecolor light as the first pixel, in which the second pixel is disposedbetween the third pixel and the fourth pixel.

Any one of the first pixel and the second pixel may be a red lightemission pixel, the other pixel may be a blue light emission pixel, andthe third pixel may be a green light emission pixel.

The plurality of pixels may include a first pixel and a second pixelwhich emit light having different colors, and a third pixel disposedbetween the first pixel and second pixel, the driving voltage lines mayinclude a first driving voltage line, a second driving voltage line, anda third driving voltage line which supply the driving voltage to thefirst pixel, the second pixel, and the third pixel, respectively, thedata lines may include a first data line, a second data line, and athird data line which supply a first data voltage, a second datavoltage, and a third data voltage to the first pixel, the second pixel,and the third pixel, respectively, the initialization voltage lines mayinclude a first initialization voltage line, a second initializationvoltage line, and a third initialization voltage line which supply theinitialization voltage to the first pixel, the second pixel, and thethird pixel, respectively, and the driving connecting member of thefirst pixel may be disposed between the first driving voltage line andthe first initialization voltage line, the driving connecting member ofthe second pixel may be disposed between the second driving voltage lineand the second initialization voltage line, and the driving connectingmember of the third pixel may be disposed between the third drivingvoltage line and the third initialization voltage line.

The driving connecting member, the initialization voltage line, thedriving voltage line, and the data line may be formed on the same layer.

The driving connecting member may be disposed between the initializationvoltage line and the driving voltage line.

The OLED display may further include a gate insulating layer formed onthe substrate; a first storage electrode formed on the gate insulatinglayer and forming a gate electrode of the driving transistor; a firstinterlayer insulating layer covering the gate insulating layer and thefirst storage electrode; a second storage electrode formed on theinterlayer insulating layer and overlapping the first storage electrode;and a second interlayer insulating layer covering the second storageelectrode and the interlayer insulating layer, in which the drivingconnecting member, the initialization voltage line, and the drivingvoltage line may be formed on the second interlayer insulating layer.

The driving connecting member may be connected to the first storageelectrode through a contact hole passing through the second storageelectrode while being insulated from the second storage electrode.

The OLED display may further include a compensation transistorcompensating for a threshold voltage of the driving transistor andconnected to the driving drain electrode of the driving transistor, inwhich the driving connecting member may connect the compensation drainelectrode of the compensation transistor and the driving gate electrodeto each other.

The OLED display may further include a semiconductor formed on thesubstrate and including a switching channel of the switching transistorand a driving channel of the driving transistor which are spaced apartfrom each other, in which the driving channel may overlap the drivinggate electrode and the driving channel is curved on a plane.

Another aspect is an organic light-emitting diode (OLED) display,comprising: a substrate; a plurality of scan lines formed over thesubstrate and configured to transfer a scan signal; a plurality of datalines crossing the scan lines and configured to transfer a plurality ofdata voltages; a driving voltage line crossing the scan lines andconfigured to transfer a driving voltage; an initialization voltage linecrossing the scan lines and configured to transfer an initializationvoltage; and a plurality of pixels formed where the scan lines and thedata lines cross. At least one of the pixels includes: a switchingtransistor electrically connected to the corresponding scan and datalines; a driving transistor electrically connected to the switchingtransistor and configured to receive the initialization voltage from theinitialization voltage line; a driving connector electrically connectedto a driving gate electrode of the driving transistor; and an OLEDelectrically connected to the driving transistor, wherein the drivingconnector is spaced apart from the data lines, and wherein one of theinitialization voltage line and the driving voltage line is interposedbetween the driving connector and the corresponding data line.

In the above OLED display, the data voltages include first to third datavoltages, wherein the pixels include a first pixel and a second pixeladjacent to the first pixel, wherein the data lines include a first dataline configured to transfer the first data voltage to the first pixeland a second data line configured to transfer the second data voltage tothe second pixel, wherein the first data line is spaced apart from thedriving connector with one of the initialization voltage line and thedriving voltage line interposed therebetween, and wherein the seconddata line is spaced apart from the driving connector of the first pixelwith the other one of the initialization voltage line and the drivingvoltage line interposed therebetween.

In the above OLED display, the pixels includes a first pixel and asecond pixel configured to emit light having different colors, and athird pixel formed between the first pixel and second pixel, wherein thedriving voltage line is formed between the first and third pixels, andwherein the initialization voltage line is formed between the second andthird pixels.

In the above OLED display, the data lines include first to third datalines configured to respectively transfer first to third data signals tothe first to third pixels, wherein the driving voltage line is formedbetween the driving connector of the third pixel and the third dataline, and wherein the initialization voltage line is formed between thedriving connector of the third pixel and the second data line.

The above OLED display further comprises a fourth pixel configured toemit light of the same color as the third pixel, wherein the secondpixel is formed between the third and fourth pixels.

In the above OLED display, the data lines include first to fourth datalines configured respectively transfer first to fourth data signals tothe first to fourth pixels, wherein the driving voltage lines includefirst to fourth driving voltage lines configured to respectivelytransfer the driving voltage to the first to fourth pixels, wherein theinitialization voltage line includes first and second initializationvoltage lines configured to respectively supply the initializationvoltage to the third and fourth pixels, wherein the third drivingvoltage line is formed between the driving connector of the third pixeland the third data line, wherein the first initialization voltage lineis formed between the driving connector of the third pixel and thesecond data line, wherein the third driving voltage line is formedbetween the driving connector of the fourth pixel and the fourth dataline, and wherein the driving connector of the fourth pixel is formedbetween the fourth driving voltage line and the second initializationvoltage line.

The above OLED display further comprises a fourth pixel configured toemit light of the same color as the first pixel, wherein the secondpixel is formed between the third and fourth pixels.

In the above OLED display, one of the first and second pixels includes ared light emission pixel, wherein the other pixel includes a blue lightemission pixel, and wherein the third pixel is a green light emissionpixel.

In the above OLED display, the pixels includes first and second pixelsconfigured to emit light having different colors, and a third pixelformed between the first and second pixels, wherein the driving voltagelines include first to third driving voltage lines configured torespectively supply the driving voltage to the first to third pixels,wherein the data lines include first to third data lines configured torespectively supply the first to third data voltages to the first tothird pixels, wherein the initialization voltage lines include first tothird initialization voltage lines configured to respectively supply theinitialization voltage to the first to third pixels, wherein the drivingconnector of the first pixel is formed between the first driving voltageline and the first initialization voltage line, wherein the drivingconnector of the second pixel is formed between the second drivingvoltage line and the second initialization voltage line, and wherein thedriving connector of the third pixel is formed between the third drivingvoltage line and the third initialization voltage line.

In the above OLED display, the driving connector, the initializationvoltage line, the driving voltage line, and the data lines are formed onthe same layer.

In the above OLED display, the driving connector is formed between theinitialization voltage line and the driving voltage line.

The above OLED display further comprises: a gate insulating layer formedover the substrate; a first storage electrode formed over the gateinsulating layer and configured to function as a gate electrode of thedriving transistor; a first interlayer insulating layer covering thegate insulating layer and the first storage electrode; a second storageelectrode formed over the interlayer insulating layer and overlappingthe first storage electrode in the depth dimension of the OLED display;and a second interlayer insulating layer covering the second storageelectrode and the interlayer insulating layer, wherein the drivingconnector, the initialization voltage line, and the driving voltage lineare formed over the second interlayer insulating layer.

In the above OLED display, the driving connector is electricallyconnected to the first storage electrode via a contact hole passingthrough the second storage electrode, and wherein the driving connectoris electrically insulated from the second storage electrode.

The above OLED display further comprises a compensation transistorconfigured to compensate a threshold voltage of the driving transistorand electrically connected to the driving drain electrode of the drivingtransistor, wherein the driving connector is configured to electricallyconnect the compensation drain electrode of the compensation transistorto the driving gate electrode.

The above OLED display further comprises a semiconductor formed over thesubstrate and including a switching channel of the switching transistorand a driving channel of the driving transistor which are spaced apartfrom each other, wherein the driving channel overlaps the driving gateelectrode in the depth dimension of the OLED display, and wherein thedriving channel is non-linear.

Another aspect is an organic light-emitting diode (OLED) display,comprising: a plurality of pixels; a data line formed adjacent to thepixels and configured to transfer a data voltage; a driving voltage lineformed substantially parallel to the data line and configured totransfer a driving voltage; and an initialization voltage line formedsubstantially parallel to the data line and configured transfer aninitialization voltage. At least one of the pixels includes: a drivingtransistor including a driving gate electrode and configured to receivethe initialization voltage from the initialization voltage line; adriving connector spaced apart from the data line and electricallyconnected to the driving gate electrode; and an OLED electricallyconnected to the driving transistor, wherein at least one of theinitialization voltage line and the driving voltage line is interposedbetween the driving connector and the data line.

The OLED display of claim 16, wherein the data line includes first tothird data lines substantially parallel to each other, and wherein theinitialization voltage line is interposed between the driving connectorand the third data line.

In the above OLED display, the driving voltage line is interposedbetween the driving connector and the first data line.

In the above OLED display, the driving connector, the first data line,and the initialization voltage line are spaced apart from one another.

In the above OLED display, the driving connector, the third data line,and the driving voltage line are spaced apart from one another.

According to at least one of the disclosed embodiments, aninitialization voltage line or a driving voltage line which is aconductor is disposed between a driving connecting member and a dataline, and as a result, a parasitic capacitor between the drivingconnecting member and the data line is reduced to minimize a change ofthe driving gate voltage due to the data voltage and a verticalcrosstalk due to the minimized change of the driving gate voltage.

Further, since the data voltage may be increased by minimizing akickback voltage due to the parasitic capacitor, a driving range of adriving gate-source voltage between the driving gate electrode connectedto the driving connecting member and the driving source electrode may beincreased. Therefore, grays of light emitted from the OLED may be morefinely controlled, and as a result, a resolution of the OLED display maybe enhanced and display quality may be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an equivalent circuit diagram illustrating one pixel of anOLED display according to an exemplary embodiment.

FIG. 2 is a timing diagram of a signal applied to one pixel in the OLEDdisplay according to the exemplary embodiment.

FIG. 3 is a diagram schematically illustrating a plurality oftransistors and capacitors in the OLED display according to theexemplary embodiment.

FIG. 4 is a detailed layout view of FIG. 3.

FIG. 5 is a cross-sectional view of the OLED display of FIG. 4 takenalong line V-V.

FIG. 6 is a diagram illustrating a schematic configuration of an OLEDdisplay according to another exemplary embodiment.

FIG. 7 is a diagram illustrating a schematic configuration of an OLEDdisplay according to yet another exemplary embodiment.

FIG. 8 is a diagram illustrating a schematic configuration of an OLEDdisplay according to still another exemplary embodiment.

DETAILED DESCRIPTION OF CERTAIN INVENTIVE EMBODIMENTS

The described technology will be described more fully hereinafter withreference to the accompanying drawings, in which exemplary embodimentsof the described technology are shown. As those skilled in the art wouldrealize, the described embodiments may be modified in various differentways, all without departing from the spirit or scope of the describedtechnology.

Accordingly, the drawings and description are to be regarded asillustrative in nature and not restrictive. Like reference numeralsdesignate like elements throughout the specification.

In addition, the size and thickness of each configuration shown in thedrawings are arbitrarily shown for understanding and ease ofdescription, but the described technology is not limited thereto. In thedrawings, the thickness of layers, films, panels, regions, etc., areexaggerated for clarity. In the drawings, for understanding and ease ofdescription, the thickness of some layers and areas is exaggerated.

Throughout the specification and the claims, unless explicitly describedto the contrary, the word “comprise” and variations such as “comprises”or “comprising” will be understood to imply the inclusion of statedelements but not the exclusion of any other elements. It will beunderstood that when an element such as a layer, film, region, orsubstrate is referred to as being “on” another element, it can bedirectly on the other element or intervening elements may also bepresent. Further, in the specification, the word “on” means positioningon or below the object portion, but does not essentially meanpositioning on the upper side of the object portion based on a gravitydirection.

Further, throughout the specification, the word “on a plane” meansviewing a target portion from the top, and the word “on a cross section”means viewing a cross section formed by vertically cutting a targetportion from the side. In this disclosure, the term “substantially”includes the meanings of completely, almost completely or to anysignificant degree under some applications and in accordance with thoseskilled in the art. The term “connected” can include an electricalconnection.

Further, the numbers of thin film transistors (TFTs) and capacitors arenot limited to those illustrated in the accompanying drawing, and theOLED display may include a plurality of transistors and one or morecapacitors in one pixel, and a separate wire is further formed or anexisting wire is omitted such that the OLED display may have variousstructures. Here, the pixel is a minimum unit of displaying an image,and the OLED display displays an image through the plurality of pixels.

Hereinafter, an OLED display according to an exemplary embodiment willbe described in detail with reference to the accompanying drawings.

FIG. 1 is an equivalent circuit diagram illustrating one pixel of anOLED display according to an exemplary embodiment.

As illustrated in FIG. 1, the OLED display according to the exemplaryembodiment includes a plurality of signal lines 151, 152, 153, 158, 171,172, and 173, and a plurality of pixels PX which are connected to thesignal lines and arranged substantially in a matrix form.

One pixel PX includes a plurality of transistors T1, T2, T3, T4, T5, T6,and T7 connected to the signal lines 151, 152, 153, 158, 171, 172, and173, a storage capacitor Cst, and an OLED.

The plurality of transistors T1, T2, T3, T4, T5, T6, and T7 include adriving transistor T1, a switching transistor T2, a compensationtransistor T3, an initialization transistor T4, an operation controltransistor T5, and a light emission control transistor T6, and a bypasstransistor T7.

The signal lines 151, 152, 153, 158, 171, 172, and 173 include a scanline 151 transferring a scan signal Sn, a previous scan line 152transferring a previous scan signal Sn−1 to the initializationtransistor T4, a light emission control line 153 transferring a lightemission control signal EM to the operation control transistor T5 andthe light emission control transistor T6, a bypass control line 158transferring a bypass signal BP to the bypass transistor T7, a data line171 crossing the scan line 151 and transferring a data signal Dm, adriving voltage line 172 transferring a driving voltage ELVDD and formedto be substantially parallel with the data line 171, and aninitialization voltage line 173 transferring an initialization voltageVint initializing the driving transistor T1.

A gate electrode G1 of the driving thin film transistor T1 is connectedto one end Cst1 of the storage capacitor Cst, and a source electrode S1of the driving thin film transistor T1 is connected to the drivingvoltage line 172 via the operation control thin film transistor T5. Adrain electrode D1 of the driving transistor T1 is electricallyconnected to an anode of the OLED via the emission control thin filmtransistor T6. The driving transistor T1 receives the data signal Dmaccording to a switching operation of the switching transistor T2 tosupply a driving current ld to the OLED.

A gate electrode G2 of the switching transistor T2 is connected to thescan line 151, and a source electrode S2 of the switching transistor T2is connected to the data line 171 A drain electrode D2 of the switchingtransistor T2 is connected to the source electrode S1 of the drivingtransistor T1 and substantially simultaneously (or concurrently)connected to the driving voltage line 172 via the operation controltransistor T5. The switching transistor T2 is turned on according to thescan signal Sn received through the scan line 151 to perform a switchingoperation that transfers the data signal Dm transferred to the data line171 to the source electrode S1 of the driving transistor T1.

A gate electrode G3 of the compensation transistor T3 is connected tothe scan line 151. A source electrode S3 of the compensation transistorT3 is connected to the drain electrode D1 of the driving transistor T1and substantially simultaneously (or concurrently) connected to an anodeof the OLED via the light emission control transistor T6. A drainelectrode D3 of the compensation transistor T3 is connected to the drainelectrode D4 of the initialization transistor T4, one end Cst1 of thestorage capacitor Cst, and the gate electrode G1 of the drivingtransistor T1. The compensation transistor T3 is turned on according tothe scan signal Sn received through the scan line 151 and connects thegate electrode G1 and the drain electrode D1 of the driving transistorT1 to diode-connect the driving transistor T1.

A gate electrode G4 of the initialization transistor T4 is connected tothe previous scan line 152, and a source electrode S4 of theinitialization transistor T4 is connected to the initialization voltageline 173. A drain electrode D4 of the initialization transistor T4 issubstantially simultaneously (or concurrently) connected to one end Cst1of the storage capacitor Cst and the gate electrode G1 of the drivingtransistor T1 via the drain electrode D3 of the compensation transistorT3. The initialization transistor T4 is turned on according to theprevious scan signal Sn−1 received through the previous scan line 152 totransfer the initialization voltage Vint to the gate electrode G1 of thedriving transistor T1 and then perform an initialization operation ofinitializing a gate voltage Vg of the gate electrode G1 of the drivingtransistor T1.

A gate electrode G5 of the operation control transistor T5 is connectedto the light emission control line 153, and a source electrode S5 of theoperation control transistor T5 is connected to the driving voltage line172. A drain electrode D5 of the operation control transistor T5 isconnected to the source electrode S1 of the driving transistor T1 andthe drain electrode D2 of the switching transistor T2.

A gate electrode G6 of the light emission control transistor T6 isconnected to the light emission control line 153, and a source electrodeS6 of the light emission control transistor T6 is connected to the drainelectrode D1 of the driving transistor T1 and the source electrode S3 ofthe compensation transistor T3. A drain electrode D6 of the lightemission control transistor T6 is electrically connected to an anode ofthe OLED. The operation control transistor T5 and the light emissioncontrol transistor T6 are substantially simultaneously (or concurrently)turned on according to the light emission control signal EM receivedthrough the light emission control line 153, and as a result, thedriving voltage ELVDD is compensated through the diode-connected drivingtransistor T1 to be transferred to the OLED.

A gate electrode G7 of the bypass transistor T7 is connected to thebypass control line 158, and a source electrode S7 of the bypasstransistor T7 is connected together to the drain electrode D6 of thelight emission control transistor T6 and the anode of the OLED. A drainelectrode D7 of the bypass transistor T7 is connected together to theinitialization voltage line 173 and the source electrode S4 of theinitialization transistor T4.

The bypass transistor T7 receives the bypass signal Sn+1 from the bypasscontrol line 158. Accordingly, a part of the driving current ld isdischarged through the bypass transistor T7 at a bypass current Ibp.

The other end Cst2 of the storage capacitor Cst is connected to thedriving voltage line 172, and a cathode of the OLED is connected to acommon voltage line 741 transferring the common voltage ELVSS.

In the exemplary embodiment, seven transistors including the bypasstransistor T7 and one capacitor is illustrated, but the describedtechnology is not limited thereto, and the number of transistors and thenumber of capacitors may be variously modified.

Hereinafter, a detailed operation process of one pixel of the OLEDdisplay according to the exemplary embodiment will be described indetail with reference to FIG. 2.

FIG. 2 is a timing diagram of a signal applied to one pixel in the OLEDdisplay according to the exemplary embodiment.

As illustrated in FIG. 2, first, for an initializing period, theprevious scan signal Sn−1 at a low level is supplied through theprevious scan line 152. Then, the initialization transistor T4 is turnedon in response to the previous scan signal Sn−1 at the low level, theinitialization voltage Vint is connected to the gate electrode G1 of thedriving transistor T1 through the initialization transistor T4 from theinitialization voltage line 173, and the driving transistor T1 isinitialized by the initialization voltage Vint.

Thereafter, for a data programming period, the scan signal Sn at the lowlevel is supplied through the scan line 151. Then, the switchingtransistor T2 and the compensation transistor T3 are turned on inresponse to the scan signal Sn at the low level. In this case, thedriving transistor T1 is diode-connected by the turned-on compensationtransistor T3 and biased in a forward direction.

Then, a compensation voltage Dm+Vth (Vth is a negative (−) value), whichis the data signal Dm supplied from the data line 171 reduced by athreshold voltage Vth of the driving transistor T1, is applied to thegate electrode G1 of the driving transistor T1. For example, the gatevoltage Vg applied to the gate electrode G1 of the driving transistor T1becomes the compensation voltage Dm+Vth.

The driving voltage ELVDD and the compensation voltage Dm+Vth areapplied to both ends of the storage capacitor Cst, and a chargecorresponding to a voltage difference between both ends is stored in thestorage capacitor Cst.

Thereafter, for the emission period, the light emission control signalEM supplied from the light emission control line 153 is changed from thehigh level to the low level. Then, for the light emission period, theoperation control transistor T5 and the light emission controltransistor T6 are turned on by the light emission control signal EM atthe low level.

Then, the driving current ld is generated according to the voltagedifference between the gate voltage of the gate electrode G1 of thedriving transistor T1 and the driving voltage ELVDD. And the drivingcurrent ld is supplied to the OLED through the light emission controltransistor T6. For the light emission period, the gate-source voltageVgs of the driving transistor T1 is maintained to ‘(Dm+Vth)-ELVDD’ bythe storage capacitor Cst, and according to a current-voltagerelationship of the driving transistor T1, the driving current ld issubstantially proportional to the square ‘(Dm-ELVDD)’ of a valueobtained by subtracting the threshold voltage from the drivingsource-gate voltage. Accordingly, the driving current ld is determinedregardless of the threshold voltage Vth of the driving transistor T1.

In this case, the bypass thin film transistor T7 receives the bypasssignal Sn+1 from the bypass control line 158. Accordingly, a part of thedriving current ld is discharged through the bypass transistor T7 at abypass current Ibp.

Even in the case where a minimum current of the driving transistor T1displaying a black image flows as the driving current, when the OLEDemits light, the black image is not displayed well.

Accordingly, the bypass thin film transistor T7 of the OLED displayaccording to the exemplary embodiment may distribute a part of theminimum current of the driving transistor T1 as the bypass current Ibpto another current path other than the current path of the OLED side.Here, the minimum current of the driving transistor T1 means a currentunder a condition in which the driving transistor T1 is turned offbecause the gate-source voltage Vgs of the driving transistor T1 is lessthan the threshold voltage Vth. The minimum driving current (forexample, a current of about 10 pA or less) under the condition in whichthe driving transistor T1 is turned off is transferred to the OLED to bedisplayed as an image with black luminance. When the minimum drivingcurrent expressing the black image flows, an influence on a bypasstransfer of the bypass current Ibp is large, but when a large drivingcurrent expressing an image such as a normal image or a white imageflows, there may be little influence on the bypass current Ibp.Accordingly, when the driving current displaying a black image flows,the emission current holed of the OLED which is reduced by the currentamount of the bypass current Ibp which flows out from the drivingcurrent ld through the bypass thin film transistor T7 has a minimumcurrent amount as a level which may exactly display the black image.Therefore, a black luminance image is exactly implemented by using thebypass transistor T7, thereby improving a contrast ratio. In FIG. 2, thebypass signal BP is the same as the previous scan signal Sn−1, but isnot necessarily limited thereto.

Hereinafter, a detailed structure of the OLED display illustrated inFIGS. 1 and 2 will be described in detail with reference to FIGS. 3, 4,5, and 6.

FIG. 3 is a diagram schematically illustrating a plurality oftransistors and capacitors in the OLED display according to theexemplary embodiment. FIG. 4 is a detailed layout view of FIG. 3. Inaddition, FIG. 5 is a cross-sectional view of the OLED display of FIG. 4taken along line V-V.

Hereinafter, a detailed planar structure of the OLED display accordingto the exemplary embodiment will be first described in detail withreference to FIGS. 3 and 4 and a detailed cross-sectional structure willbe described in detail with reference to FIGS. 5, 6, and 7.

As illustrated in FIGS. 3 and 4, the OLED display according to theexemplary embodiment includes a scan line 151, the previous scan line152, the light emission control line 153, and the bypass control line158 which are formed in a row direction. The OLED display also includesthe data line 171 and the driving voltage line 172, and a plurality ofpixels PXG and PXR.

The scan line 151, the previous scan line 152, the light emissioncontrol line 153, and the bypass control line 158 are formed in the rowdirection, and respectively apply a scan signal Sn, a previous scansignal Sn−1, a light emission control signal EM, and a bypass signalSn+1.

The data line 171 and the driving voltage line 172 cross the scan line151, the previous scan line 152, the light emission control line 153,and the bypass control line 158 and apply a data signal Dm and a drivingvoltage ELVDD to the pixels PXG and PXR.

In addition, the pixels PXG and PXR are formed at a point where the scanline 151 and the data line 171 cross each other and emits light bysignals transferred from the scan line 151 and the data line 171.

The pixels PXG and PXR include a first pixel PXG and a second pixel PXRwhich are disposed to be adjacent to each other. For example, the firstpixel PXG is a green light emission pixel emitting green light, and thesecond pixel PXR is a red light emission pixel emitting red light.

The OLED display according to the exemplary embodiment may be formed ina stripe type which is disposed in the order of a red light emissionpixel R, a green light emission pixel G, a blue light emission pixel B,and a red light emission pixel R or in a pantile type which is disposedin the order of a red light emission pixel R, a green light emissionpixel G, a blue light emission pixel B, and a green light emission pixelG. However, the spirit of the described technology is not limitedthereto, and pixels having different colors may be disposed in anotherorder other than the aforementioned order.

The driving voltage line 172 is formed to be parallel with the data line171.

In addition, the initialization voltage Vint is transferred to thecompensation transistor T3 through the initialization transistor T4 fromthe initialization voltage line 173.

Further, in the first pixel PXG, the driving transistor T1, theswitching transistor T2, the compensation transistor T3, theinitialization transistor T4, the operation control transistor T5, thelight emission control transistor T6, the bypass transistor T7, thestorage capacitor Cst, and the OLED are formed.

The OLED is configured by a pixel electrode 191, an organic emissionlayer 370, and a common electrode 270. The compensation transistor T3and the initialization transistor T4 may be configured by a dual gatestructure transistor in order to block a leakage current.

Respective channels of the driving transistor T1, the switchingtransistor T2, the compensation transistor T3, the initializationtransistor T4, the operation control transistor T5, the light emissioncontrol transistor T6, and the bypass transistor T7 are formed insideone semiconductor 130 connected, and the semiconductor 130 may be formedto be curved in various shapes. The semiconductor 130 may be formed ofpolysilicon or an oxide semiconductor. The oxide semiconductor mayinclude any one of oxides based on titanium (Ti), hafnium (Hf),zirconium (Zr), aluminum (Al), tantalum (Ta), germanium (Ge), zinc (Zn),gallium (Ga), tin (Sn), or indium (In), and zinc oxide (ZnO),indium-gallium-zinc oxide (InGaZnO4), indium-zinc oxide (Zn—In—O), zinctin oxide (Zn—Sn—O), indium-gallium oxide (In—Ga—O), indium-tin oxide(In—Sn—O), indium-zirconium oxide (In—Zr—O), indium-zirconium-zinc oxide(In—Zr—Zn—O), indium-zirconium-tin oxide (In—Zr—Sn—O),indium-zirconium-gallium oxide (In—Zr—Ga—O), indium aluminum oxide(In—Al—O), indium-zinc-aluminum oxide (In—Zn—Al—O), indium-tin-aluminumoxide (In—Sn—Al—O), indium-aluminum-gallium oxide (In—Al—Ga—O),indium-tantalum oxide (In—Ta—O), indium-tantalum-zinc oxide(In—Ta—Zn—O), indium-tantalum-tin oxide (In—Ta—Sn—O),indium-tantalum-gallium oxide (In—Ta—Ga—O), indium-germanium oxide(In—Ge—O), indium-germanium-zinc oxide (In—Ge—Zn—O),indium-germanium-tin oxide (In—Ge—Sn—O), indium-germanium-gallium oxide(In—Ge—Ga—O), titanium-indium-zinc oxide (Ti—In—Zn—O), andhafnium-indium-zinc oxide (Hf—In—Zn—O) which are complex oxides thereof.

In the case where the semiconductor 130 is formed of the oxidesemiconductor, in order to protect an oxide semiconductor materialvulnerable to an external environment such as a high temperature, aseparate passivation layer may be added.

The semiconductor 130 includes a channel which is channel-doped with anN-type impurity or a P-type impurity. The semiconductor 130 alsoincludes a source doping region and a drain doping region which areformed at both sides of the channel and doped at a higher concentrationthan a doped concentration of the doping impurity doped on the channel.In the exemplary embodiment, the source doping region and the draindoping region correspond to the source electrode and the drainelectrode, respectively. The source electrode and the drain electrodesformed in the semiconductor 130 may be formed by doping only thecorresponding regions. Further, in the semiconductor 130, a regionbetween source electrodes and drain electrodes of different transistorsis doped and thus the source electrode and the drain electrode may beelectrically connected to each other.

As illustrated in FIG. 4, the channel 131 includes a driving channel 131a formed in the driving transistor T1, a switching channel 131 b formedin the switching transistor T2, a compensation channel 131 c formed inthe compensation transistor T3, an initialization channel 131 d formedin the initialization transistor T4, an operation control channel 131 eformed in the operation control transistor T5, a light emission controlchannel 131 f formed in the light emission control transistor T6, and abypass channel 131 g formed in the bypass transistor T7.

The driving transistor T1 includes a driving channel 131 a, a drivinggate electrode 155 a, a driving source electrode 136 a, and a drivingdrain electrode 137 a.

The driving channel 131 a is curved and may have a meandering shape or azigzag shape. As such, the curved driving channel 131 a is formed, andthus the driving channel 131 a may be elongated in a narrow space.Accordingly, the driving range of the driving gate-source voltage Vgsbetween the driving gate electrode 155 a and the driving sourceelectrode 136 a is increased by the elongated driving channel 131 a.Since the driving range of the driving gate-source voltage Vgs isincreased, grays of light emitted from the OLED may be more finelycontrolled by changing a magnitude of the driving gate-source voltageVgs, and as a result, a resolution of the OLED display may be enhancedand display quality may be improved.

Various examples such as ‘reverse S’, ‘S’, ‘M’, and ‘W’ may beimplemented by variously modifying the shape of the driving channel 131a.

The driving gate electrode 155 a overlaps the driving channel 131 a, andthe driving source electrode 136 a and the driving drain electrode 137 aare formed to be adjacent to both sides of the driving channel 131 a,respectively. The driving gate electrode 155 a is connected to a drivingconnecting member (or driving connector) 176 through a first contacthole 61.

The switching transistor T2 includes a switching channel 131 b, aswitching gate electrode 155 b, a switching source electrode 136 b, anda switching drain electrode 137 b. The switching gate electrode 155 bwhich is a part extended from the scan line 151 overlaps the switchingchannel 131 b, and the switching source electrode 136 b and theswitching drain electrode 137 b are formed to be adjacent to both sidesof the switching channel 131 b, respectively. The switching sourceelectrode 136 b is connected to the data line 171 through a secondcontact hole 62.

The compensation transistor T3 includes a compensation channel 131 c, acompensation gate electrode 155 c, a compensation source electrode 136c, and a compensation drain electrode 137 c. Two compensation gateelectrodes 155 c which are parts of the scan line 151 are formed inorder to prevent a leakage current and overlap the compensation channel131 c. The compensation source electrode 136 c and the compensationdrain electrode 137 c are formed to be adjacent to both sides of thecompensation channel 131 c, respectively.

The compensation drain electrode 137 c is connected to the drivingconnecting member 176 through a third contact hole 63.

The initialization transistor T4 includes an initialization channel 131d, an initialization gate electrode 155 d, an initialization sourceelectrode 136 d, and an initialization drain electrode 137 d. Twoinitialization gate electrodes 155 d which are parts of the scan line152 are formed in order to prevent a leakage current and overlap theinitialization channel 131 d. The initialization source electrode 136 dand the initialization drain electrode 137 d are formed to be adjacentto both sides of the initialization channel 131 d, respectively. Theinitialization source electrode 136 d is connected to the initializationconnecting member 175 through a fourth contact hole 64.

The operation control transistor T5 includes an operation controlchannel 131 e, an operation control gate electrode 155 e, an operationcontrol source electrode 136 e, and an operation control drain electrode137 e. The operation control gate electrode 155 e which is a part of thelight emission control line 153 overlaps the operation control channel131 e, and the operation control source electrode 136 e and theoperation control drain electrode 137 e are formed to be adjacent toboth sides of the operation control channel 131 e, respectively. Theoperation control source electrode 136 e is connected to the drivingvoltage line 172 through a fifth contact hole 65.

The light emission control transistor T6 includes a light emissioncontrol channel 131 f, a light emission control gate electrode 155 f, alight emission control source electrode 136 f, and a light emissioncontrol drain electrode 137 f. The light emission control gate electrode155 f which is a part of the light emission control line 153 overlapsthe light emission control channel 131 f, and the light emission controlsource electrode 136 f and the light emission control drain electrode137 f are formed to be adjacent to both sides of the light emissioncontrol channel 131 f, respectively. The light emission control drainelectrode 137 f is connected to a light emission control connectingmember 179 through a sixth contact hole 66.

The bypass transistor T7 includes a bypass channel 131 g, a bypass gateelectrode 155 g, a bypass source electrode 136 g, and a bypass drainelectrode 137 g. The bypass gate electrode 155 g which is a part of thebypass control line 158 overlaps the bypass channel 131 g, and thebypass source electrode 136 g and the bypass drain electrode 137 g areformed to be adjacent to both sides of the bypass channel 131 g,respectively.

The bypass source electrode 136 g is directly connected to the lightemission control drain electrode 137 f, and the bypass drain electrode137 g is directly connected to the initialization source electrode 136d.

One end of the driving channel 131 a of the driving transistor T1 isconnected to the switching drain electrode 137 b and the operationcontrol drain electrode 137 e, and the other end of the driving channel131 a is connected to the compensation source electrode 136 c and thelight emission control source electrode 136 f.

The storage capacitor Cst includes a first storage electrode 155 a and asecond storage electrode 178 which are disposed with an interlayerinsulating layer 160 therebetween. The first storage electrode 155 acorresponds to the driving gate electrode 155 a, and the second storageelectrode 178 is an extended region of the first driving voltage line172 a and formed one by one for every one pixel.

Here, the interlayer insulating layer 160 is a dielectric material, anda storage capacitance is determined by a voltage between the chargeaccumulated in the storage capacitor Cst and a voltage between bothcapacitor plates 155 a and 156. As such, a space which may form astorage capacitor in a narrow space by the driving channel 131 a havinga large area in the pixel may be ensured by using the driving gateelectrode 155 a.

The first storage electrode 155 a which is the driving gate electrode155 a is connected to the driving connecting member 176 through thefirst contact hole 61.

In this case, the first contact hole 61 passes through the secondstorage electrode 178 in an insulated state from the second storageelectrode 178 to be connected to the first storage electrode 155 adisposed to overlap the second storage electrode 178.

The driving connecting member 176 is formed on the same layer to besubstantially parallel with the data line 171. The other end of thedriving connecting member 176 is connected to the compensation drainelectrode 137 c of the compensation transistor T3 and the initializationdrain electrode 137 d of the initialization transistor T4 through thethird contact hole 63.

For example, the driving connecting member 176 connects the driving gateelectrode 155 a, the compensation drain electrode 137 c of thecompensation transistor T3, and the initialization drain electrode 137 dof the initialization transistor T4 to each other. The drivingconnecting member 176 corresponds to a gate node GN illustrated on theequivalent circuit diagram of FIG. 1.

The second storage electrode 178 is formed as an extension extended fromthe first driving voltage line 172 a.

Accordingly, the storage capacitor Cst stores a storage capacitancecorresponding to a difference between the driving voltage ELVDDtransferred to the second storage electrode 178 through the drivingvoltage line 172 and the driving gate voltage Vg of the driving gateelectrode 155 a.

The data line 171 crosses the scan line 151 and extends in a columndirection, and the driving voltage line 172 is spaced apart from thedata line 171 to extend in a column direction.

The data line 171 includes a first data line 171 a where the data signalDm1 is transferred to the first pixel PXG, a second data line 171 bwhere a next data signal Dm2 is transferred to the adjacent second pixelPXR, and a third data line 171 c where the data signal is transferred toa third pixel (not illustrated) disposed at an opposite side of thesecond pixel PXR based on the first pixel PXG.

The first data line 171 a and the second data line 171 b are spacedapart from each other with the second driving voltage line 172 bproviding the driving voltage to the second pixel PXR.

A parasitic capacitor Ca is generated between the data line 171 and thedriving connecting member 176, and the parasitic capacitor Ca allows thedata signal Dm of the data line 171 and a change of the next data signalDm+1 to influence the driving connecting member 176.

Accordingly, the driving gate voltage Vg of the driving gate electrode155 a connected to the driving connecting member 176 is changed toinfluence the luminance, and as a result, vertical crosstalk occurs.

In the exemplary embodiment, the initialization voltage line 173 aredisposed between the driving connecting member 176 and the third dataline 171 c and the first driving voltage line 172 a are disposed betweenthe driving connecting member 176 and the first data line 171 a, tominimize the parasitic capacitor between the data line 171 and thedriving connecting member 176.

For example, the driving connecting member 176 is spaced apart from thethird data line 171 c with the initialization voltage line 173therebetween. Further, the driving connecting member 176 is spaced apartfrom the first data line 171 a with the first driving voltage line 172 atherebetween.

For example, the driving connecting member 176, the first data line 171a, the second data line 171 b, the initialization voltage line 173, andthe first driving voltage line 172 a are formed on the same layer.

In addition, the first data line 171 a and the second data line 171 bare spaced apart from each other with the second driving voltage line172 b therebetween. Similarly, the driving connecting member 176 and thesecond data line 171 b are spaced apart from each other with the firstdriving voltage line 172 a therebetween.

For example, the first data line 171 a is spaced apart from the drivingconnecting member 176 of the first pixel PXG with the first drivingvoltage line 172 a therebetween and spaced apart from the drivingconnecting member 176 of the first pixel PXG with the initializationvoltage line 173 therebetween.

The initialization voltage line 173 and the driving voltage line 172which are conductors to which the voltages are applied are disposedbetween the driving connecting member 176 and the data line 171 toreduce the parasitic capacitance between the driving connecting member176 and the data line 171, thereby minimizing a change of the drivinggate voltage Vg due to the data voltage and the vertical crosstalk dueto the change of the driving gate voltage Vg.

Further, since the data voltage Dm may be increased by minimizing akickback voltage due to the parasitic capacitor, the driving range ofthe driving gate-source voltage Vgs between the driving gate electrode155 a connected to the driving connecting member 176 and the drivingsource electrode 136 a may be increased. Therefore, grays of lightemitted from the OLED may be more finely controlled, and as a result, aresolution of the OLED display may be enhanced and display quality maybe improved.

In the exemplary embodiment, for example, the driving connecting member176 of the first pixel PXG which is the green light emission pixel isdisposed between the initialization voltage line 173 and the firstdriving voltage line 172 a, and the driving connecting member of thesecond pixel PXR which is the red light emission pixel is disposedbetween the first data line 171 a and the second driving voltage line172 b.

The driving connecting member of the second pixel PXR is disposedbetween the first data line 171 a and the second driving voltage line172 b, and as a result, vertical crosstalk may occur in the second pixelPXR by the data signal Dm applied to the first data line 171 a.

However, since the luminance of the first pixel PXG which is the greenlight emission pixel occupies about 70% or more of the luminance of allpixels including the red, blue, and green light emission pixels, inpixels having other colors except for the green light emission pixel,even though the vertical crosstalk occurs, in the entire OLED display,the effect of the vertical crosstalk is very little.

In the exemplary embodiment, in only some color pixels, the drivingconnecting member is disposed between the initialization voltage lineand the driving voltage line, but the driving connecting members of allthe pixels may be disposed between the initialization voltage line andthe driving voltage line.

The light emission control connecting member 179 having a substantiallyquadrangular shape is connected to the pixel electrode 191 through aseventh contact hole 81, and the initialization connecting member 175having a substantially quadrangular shape is connected to theinitialization voltage line 173 through an eighth contact hole 82.

Hereinafter, a cross-sectional structure of the OLED display deviceaccording to the exemplary embodiment will be described in detail withreference to FIG. 5.

A buffer layer 120 is formed on the substrate 110. The substrate 110 isformed as an insulation substrate formed of glass, quartz, ceramic,plastic, or the like. The buffer layer 120 may serve to improve acharacteristic of polysilicon by blocking impurities from the substrate110 during a crystallization process for forming polysilicon and reducestress applied to the semiconductor 130 formed on the buffer layer 120by planarizing the substrate 110. The buffer layer 120 may be formed ofsilicon nitride (SiNx) or silicon oxide (SiO2).

The semiconductor 130 is formed with the channel 131 on the buffer layer120 and includes the driving channel 131 a, the switching channel 131 b,the compensation channel 131 c, the initialization channel 131 d, theoperation control channel 131 e, the light emission control channel 131f, and the bypass channel 131 g.

The driving source electrode 136 a and the driving drain electrode 137 aare formed at both sides of the driving channel 131 a of thesemiconductor 130, and the switching source electrode 136 b and theswitching drain electrode 137 b are formed at both sides of theswitching channel 131 b. In addition, the compensation source electrode136 c and the compensation drain electrode 137 c are formed at bothsides of the compensation channel 131 c, and the initialization sourceelectrode 136 d and the initialization drain electrode 137 d are formedat both sides of the initialization channel 131 d. In addition, theoperation control source electrode 136 e and the operation control drainelectrode 137 e are formed at both sides of the operation controlchannel 131 e, and the light emission control source electrode 136 f andlight emission control drain electrode 137 f are formed at both sides ofthe light emission control channel 131 f. In addition, the bypass sourceelectrode 136 g and the bypass drain electrode 137 g are formed at bothsides of the bypass channel 131 g.

The gate insulating layer 140 is formed on the semiconductor 130 tocover the semiconductor 130. On the gate insulating layer 140, theswitching gate electrode 155 b, the compensation gate electrode 155 c,the initialization gate electrode 155 d, the operation control gateelectrode 155 e, the light emission control gate electrode 155 f, andthe bypass gate electrode 155 g, and gate lines 151, 152, 153, 158, and155 a including a driving gate electrode 155 a (a first storageelectrode) are formed.

The gate wires 151, 152, 153, 158, and 155 a may include a multilayer inwhich metal layers formed of any one of copper (Cu), a copper alloy,aluminum (Al), an aluminum alloy, molybdenum (Mo), and a molybdenumalloy are formed.

A first interlayer insulating layer 161 covering the gate wires 151,152, 153, 158, and 155 a and the gate insulating layer 140 is formed onthe gate wires 151, 152, 153, 158, and 155 a and the gate insulatinglayer 140. The first interlayer insulating layer 161 may be formed ofsilicon nitride (SiNx), silicon oxide (SiO2), or the like.

In addition, the second storage electrode 178 overlapping the firststorage electrode 155 a is formed at an upper side of the firstinterlayer insulating layer 161, and a first contact hole 61 passingthrough the second storage electrode 178 and the first interlayerinsulating layer 161 is formed. In this case, the first contact hole 61passes through the second storage electrode 178 while being insulatedfrom the second storage electrode 178.

The second interlayer insulating layer 162 covering the first interlayerinsulating layer 161 and the second storage electrode 178 is formed onthe first interlayer insulating layer 161 and the second storageelectrode 178.

Since the detailed configuration of the second interlayer insulatinglayer 162 is substantially the same as the configuration of the firstinterlayer insulating layer 161, the detailed description thereof isomitted.

On the second interlayer insulating layer 162, the data wires 171, 172,173, and 176 including the data line 171, the driving voltage line 172connected to the second storage electrode 178, the driving connectingmember 176, and the initialization voltage line 173 are formed.

The data wires 171, 172, 173, and 176 may include a multilayer in whichmetal layers formed of any one of copper (Cu), a copper alloy, aluminum(Al), an aluminum alloy, molybdenum (Mo), and a molybdenum alloy areformed. For example, may be formed by a triple layer oftitanium/aluminum/titanium (Ti/Al/Ti), or a triple layer ofmolybdenum/aluminum/molybdenum (Mo/Al/Mo) ormolybdenum/copper/molybdenum (Mo/Cu/Mo).

The driving connecting member 176 connected to the first storageelectrode 155 a among the data wires 171, 172, 173, and 176 is disposedbetween the first driving voltage line 172 a and the initializationvoltage line 173 to minimize the crosstalk due to the parasiticcapacitance with the data line 171.

One end of the driving connecting member 176 is connected to the firststorage electrode 155 a through the first contact hole 61 passingthrough the interlayer insulating layer 160 and the second storageelectrode 178. In addition, the other end of the driving connectingmember 176 is connected to the compensation drain electrode 137 c andthe initialization drain electrode 137 d through the third contact hole63 formed in the gate insulating layer 140 and the interlayer insulatinglayer 160.

A passivation layer 180 covering the data wires 171, 172, 173, and 176and the second interlayer insulating layer 162 is formed on the datawires 171, 172, 173, and 176 and the second interlayer insulating layer162.

Since the passivation layer 180 covers and planarizes the data wires171, 172, 173, and 176, the pixel electrode 191 may be formed on thepassivation layer 180 without a step.

The passivation layer 180 may be formed of an organic material such aspolyacrylates resin and polyimides resin, a formed layer formed of anorganic material and an inorganic material, or the like.

The pixel electrode 191 and the initialization voltage line 173 areformed on the passivation layer 180.

A pixel defined layer PDL 350 covering the passivation layer 180, theinitialization voltage line 173, and an edge of the pixel electrode 191is formed on the passivation layer 180, the initialization voltage line173, and an edge of the pixel electrode 191. The pixel defined layer 350may be formed of an organic material such as polyacrylates resin andpolyimides resin or a silica-based inorganic material.

An organic emission layer 370 is formed on the pixel electrode 191 and acommon electrode 270 is formed on the organic emission layer 370. Thecommon electrode 270 is also formed on the pixel defined layer 350 to beformed over the plurality of pixels PX. As such, the OLED including thepixel electrode 191, the organic emission layer 370, and the commonelectrode 270 is formed.

Here, the pixel electrode 191 is an anode which is a hole injectionelectrode, and the common electrode 270 is a cathode which is anelectron injection electrode. However, the exemplary embodiment is notlimited thereto, and according to a driving method of the OLED display,the pixel electrode 191 may be the cathode, and the common electrode 270may be the anode. The hole and electron are injected into the organicemission layer 370 from the pixel electrode 191 and the common electrode270, respectively, and an exciton generated by coupling the injectedhole and electron falls down from an excited state to a ground state toemit light.

The organic emission layer 370 may be formed of a low-molecular organicmaterial or a high-molecular organic material such as poly3,4-ethylenedioxythiophene (PEDOT). Further, the organic emission layer370 may be formed by a multilayer including one or more of a lightemission layer, a hole injection layer (HIL), a hole transporting layer(HTL), an electron transporting layer (ETL), and an electron injectionlayer (EIL). In the case where the organic emission layer 370 includesall the layers, the HIL is disposed on the pixel electrode 191 which isthe anode, and the HTL, the light emitting layer, the ETL, and the ETLare sequentially formed thereon.

The organic emission layer 370 may include a red organic emission layeremitting red light, a green organic emission layer emitting green light,and a blue organic emission layer emitting blue light. The red organicemission layer, the green organic emission layer, and the blue organicemission layer are formed in a red pixel, a green pixel, and a bluepixel, respectively, thereby implementing a colored image.

Further, in the organic emission layer 370, all of the red organicemission layer, the green organic emission layer, and the blue organicemission layer are together formed on the red pixel, the green pixel,and the blue pixel, and a red color filter, a green color filter, and ablue color filter are formed for each pixel, thereby implementing acolor image. As another example, white organic emission layers emittingwhite light are formed on all of the red, green, and blue pixels. And ared color filter, a green color filter, and a blue color filter areformed for each pixel, thereby implementing the colored image. In thecase of implementing the color image by using the white organic emissionlayers and the color filters, it is not required to use a depositionmask for depositing the red organic emission layer, the green organicemission layer, and the blue organic emission layer on respectivepixels, for example, the red pixel, the green pixel, and the blue pixel.

The white organic emission layer described in another example may beformed by one organic emission layer, and also includes a configurationformed so as to emit white light by forming a plurality of organicemission layers. For example, the white organic emission layer includesa configuration which may emit white light by combining at least oneyellow organic emission layer and at least one blue organic emissionlayer, a configuration which may emit white light by combining at leastone cyan organic emission layer and at least one red organic emissionlayer, a configuration which may emit white light by combining at leastone magenta organic emission layer and at least one green organicemission layer, and the like.

A encapsulation member (not illustrated) protecting the OLED may beformed on the common electrode 270, and the encapsulation member may besealed on the substrate 110 by a sealant and formed of various materialsincluding glass, quartz, ceramic, plastic, and metal. A thin filmencapsulation layer may be formed by depositing an inorganic layer andan organic layer on the common electrode 270 without using the sealant.

In the exemplary embodiment, it is described that the first pixel PXG isthe green light emission pixel and the second pixel PXR is the red lightemission pixel. According to the layout and the luminance of the pixel,the first pixel PXG and the second pixel PXR may be configured by othercolor light emission pixels other than green and red, for example, thefirst pixel is formed as the red or blue light emission pixel, and thesecond pixel is formed as the blue or green light emission pixel.

Hereinafter, an OLED display according to another exemplary embodimentwill be described in detail with reference to the accompanying drawings.

FIG. 6 is a diagram illustrating a schematic configuration of an OLEDdisplay according to another exemplary embodiment.

Referring to FIG. 6, the OLED display according to the exemplaryembodiment includes a first pixel PXR, a second pixel PXB, and a thirdpixel PXG1 emitting light having different colors, a fourth pixel PXG2emitting the same color as the third pixel PXG1, data lines Dm1, Dm2,Dm3, and Dm4, voltage lines ELVDD1, ELVDD2, ELVDD3, and ELVDD4, andinitialization voltage lines Vint1 and Vint2.

The third pixel PXG1 is disposed between the first pixel PXR and thesecond pixel PXB. In addition, the fourth pixel PXG2 is spaced apartfrom the third pixel PXG1 so that the second pixel PXB is disposedbetween the third pixel PXG1 and the fourth pixel PXG2.

In this case, the first pixel PXR is formed as the red light emissionpixel, the second pixel PXB is formed as the blue light emission pixel,the third pixel PXG1 and the fourth pixel PXG2 are formed as the greenlight emission pixels.

For example, the OLED display according to the exemplary embodiment isformed as an OLED display with a pantile type in which red (R)-green(G)-blue (B)-green (G), for example, four light emission pixels arerepetitively disposed.

The data lines Dm1, Dm2, Dm3, and Dm4 include a first data line Dm1, asecond data line Dm2, a third data line Dm3, and a fourth data line Dm4.

The first data line Dm1, the second data line Dm2, the third data lineDm3, and the fourth data line Dm4 transfer a first data signal, a seconddata signal, a third data signal, and a fourth data signal to the firstpixel PXR, the second pixel PXB, the third pixel PXG1, and the fourthpixel PXG2, respectively.

In addition, the driving voltage lines ELVDD1, ELVDD2, ELVDD3, andELVDD4 include a first driving voltage line ELVDD1, a second drivingvoltage line ELVDD2, a third driving voltage line ELVDD3, and a fourthdriving voltage line ELVDD4 which transfer driving voltages to the firstpixel PXR, the second pixel PXB, the third pixel PXG1, and the fourthpixel PXG2.

The initialization voltage lines Vint1 and Vint2 include a firstinitialization voltage line Vint1 supplying an initialization voltage tothe first pixel PXR, the second pixel PXB, and the third pixel PXG1 anda second initialization voltage line Vint2 supplying the initializationvoltage to the fourth pixel PXG2.

In this case, the third driving voltage line ELVDD3 is disposed betweenthe driving connecting member (not illustrated) included in the thirdpixel PXG1 and the third data line Dm3. The first initialization voltageline Vint1 is disposed between the driving connecting member of thethird pixel PXG1 and the second data line Dm2. Therefore, it is possibleto reduce the vertical crosstalk generated in the third pixel PXG1 bythe data signals of the second data line Dm2 and the third data line Dm3which are disposed at both sides of the third pixel PXG1.

Similarly, the third driving voltage line ELVDD3 is disposed between thedriving connecting member of the fourth pixel PXG2 and the fourth dataline Dm4, and the driving connecting member of the fourth pixel PXG2 isdisposed between the fourth driving voltage line ELVDD4 and the secondinitialization voltage line Vint2.

In the exemplary embodiment, for convenience of description, the firstpixel PXR, the second pixel PXB, the third pixel PXG1, and the fourthpixel PXG2 are spaced apart from the data lines Dm1, Dm2, Dm3, and Dm4and the driving voltage lines ELVDD1, ELVDD2, ELVDD3, and ELVDD4, but aconfiguration in which parts of the first pixel PXR, the second pixelPXB, the third pixel PXG1, and the fourth pixel PXG2 overlap the datalines Dm1, Dm2, Dm3, and Dm4, the driving voltage lines ELVDD1, ELVDD2,ELVDD3, and ELVDD4, and the initialization voltage lines Vint1 and Vint2is also included in the spirit of the described technology.

FIG. 7 is a diagram illustrating a schematic configuration of an OLEDdisplay according to yet another exemplary embodiment.

In the exemplary embodiment, since there is a difference in a positionwhere the initialization voltage line is formed and other configurationsare the same as the configurations of the OLED display of FIG. 6,hereinafter, features of the exemplary embodiment will be mainlydescribed.

Referring to FIG. 7, the OLED display according to the exemplaryembodiment includes a first pixel PXR, a second pixel PXB, and a thirdpixel PXG1 emitting light having different colors, a fourth pixel PXG2emitting the same color as the third pixel PXG1, data lines Dm1, Dm2,Dm3, and Dm4, driving voltage lines ELVDD1, ELVDD2, ELVDD3, and ELVDD4,and initialization voltage lines Vint1, Vint2, Vint3, and Vint4.

The initialization voltage lines Vint1, Vint2, Vint3, and Vint4 includea first initialization voltage line Vint1, a second initializationvoltage line Vint2, a third initialization voltage line Vint3, and afourth initialization voltage line Vint4 which transfer initializationvoltages to the first pixel PXR, the second pixel PXB, the third pixelPXG1, and the fourth pixel PXG2, respectively.

In this case, the driving connecting member of the first pixel PXR isdisposed between the first driving voltage line ELVDD1 and the firstinitialization voltage line Vint1, the driving connecting member of thesecond pixel PXB is disposed between the second driving voltage lineELVDD2 and the second initialization voltage line Vint2, the drivingconnecting member of the third pixel PXG1 is disposed between the thirddriving voltage line ELVDD3 and the third initialization voltage lineVint3, and the driving connecting member of the fourth pixel PXG2 isdisposed between the fourth driving voltage line ELVDD4 and the fourthinitialization voltage line Vint4.

For example, the driving connecting members of all of the pixels PXR,PXB, PXG1, and PXG2 are spaced apart from each other with the datalines, the driving voltage line, and the initialization voltage line,thereby minimizing the vertical crosstalk due to the data signaltransferred through the data line.

FIG. 8 is a diagram illustrating a schematic configuration of an OLEDdisplay according to still another exemplary embodiment.

In the exemplary embodiment, since there is a difference in aconfiguration in which pixels are disposed and other configurations arethe same as the configurations of the OLED display of FIG. 6,hereinafter, features of the exemplary embodiment will be mainlydescribed.

Referring to FIG. 8, the OLED display according to the exemplaryembodiment includes a first pixel PXR1, a second pixel PXB, and a thirdpixel PXG emitting light having different colors, a fourth pixel PXG2emitting the same color as the first pixel PXR1, data lines Dm1, Dm2,Dm3, and Dm4, driving voltage lines ELVDD1, ELVDD2, ELVDD3, and ELVDD4,and initialization voltage lines Vint1 and Vint2.

The third pixel PXG is disposed between the first pixel PXR1 and thesecond pixel PXB. In addition, the fourth pixel PXR2 is spaced apartfrom the third pixel PXG so that the second pixel PXB is disposedbetween the third pixel PXG and the fourth pixel PXR2.

In this case, the first pixel PXR1 and the fourth pixel PXR2 are formedas the red light emission pixels, the second pixel PXB is formed as theblue light emission pixel, the third pixel PXG is formed as the greenlight emission pixel.

For example, the OLED display according to the exemplary embodiment isformed as an OLED display with a stripe type in which red (R)-green(G)-blue (B), for example, three light emission pixels are repetitivelydisposed.

While the inventive technology has been described in connection withwhat is presently considered to be practical exemplary embodiments, itis to be understood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

What is claimed is:
 1. An organic light-emitting diode (OLED) display,comprising: a substrate; a plurality of scan lines formed over thesubstrate and configured to transfer a scan signal; a plurality of datalines crossing the scan lines and configured to transfer a plurality ofdata voltages; a driving voltage line crossing the scan lines andconfigured to transfer a driving voltage; an initialization voltage linecrossing the scan lines and configured to transfer an initializationvoltage; and a plurality of pixels formed where the scan lines and thedata lines cross, wherein at least one of the pixels includes: aswitching transistor electrically connected to the corresponding scanand data lines; a driving transistor electrically connected to theswitching transistor and configured to receive the initializationvoltage from the initialization voltage line; a driving connectorelectrically connected to a driving gate electrode of the drivingtransistor; and an OLED electrically connected to the drivingtransistor, wherein the driving connector is spaced apart from the datalines, wherein one of the initialization voltage line and the drivingvoltage line is interposed between the driving connector and thecorresponding data line in a plane view, wherein the pixels includes afirst pixel and a second pixel configured to emit light having differentcolors, and a third pixel formed between the first pixel and secondpixel, wherein the driving voltage line is formed between the first andthird pixels, and wherein the initialization voltage line is formedbetween the second and third pixels.
 2. The OLED display of claim 1,wherein the data lines include first to third data lines configured torespectively transfer first to third data signals to the first to thirdpixels, wherein the driving voltage line is formed between the drivingconnector of the third pixel and the third data line, and wherein theinitialization voltage line is formed between the driving connector ofthe third pixel and the second data line.
 3. The OLED display of claim1, further comprising a fourth pixel configured to emit light of thesame color as the third pixel, wherein the second pixel is formedbetween the third and fourth pixels.
 4. The OLED display of claim 3,wherein the data lines include first to fourth data lines configuredrespectively transfer first to fourth data signals to the first tofourth pixels, wherein the driving voltage lines include first to fourthdriving voltage lines configured to respectively transfer the drivingvoltage to the first to fourth pixels, wherein the initializationvoltage line includes first and second initialization voltage linesconfigured to respectively supply the initialization voltage to thethird and fourth pixels, wherein the third driving voltage line isformed between the driving connector of the third pixel and the thirddata line, wherein the first initialization voltage line is formedbetween the driving connector of the third pixel and the second dataline, wherein the third driving voltage line is formed between thedriving connector of the fourth pixel and the fourth data line, andwherein the driving connector of the fourth pixel is formed between thefourth driving voltage line and the second initialization voltage line.5. The OLED display of claim 1, further comprising a fourth pixelconfigured to emit light of the same color as the first pixel, whereinthe second pixel is formed between the third and fourth pixels.
 6. TheOLED display of claim 1, wherein one of the first and second pixelsincludes a red light emission pixel, wherein the other pixel includes ablue light emission pixel, and wherein the third pixel is a green lightemission pixel.
 7. The OLED display of claim 1, wherein the pixelsincludes first and second pixels configured to emit light havingdifferent colors, and a third pixel formed between the first and secondpixels, wherein the driving voltage lines include first to third drivingvoltage lines configured to respectively supply the driving voltage tothe first to third pixels, wherein the data lines include first to thirddata lines configured to respectively supply the first to third datavoltages to the first to third pixels, wherein the initializationvoltage lines include first to third initialization voltage linesconfigured to respectively supply the initialization voltage to thefirst to third pixels, wherein the driving connector of the first pixelis formed between the first driving voltage line and the firstinitialization voltage line, wherein the driving connector of the secondpixel is formed between the second driving voltage line and the secondinitialization voltage line, and wherein the driving connector of thethird pixel is formed between the third driving voltage line and thethird initialization voltage line.
 8. The OLED display of claim 1,wherein the driving connector, the initialization voltage line, thedriving voltage line, and the data lines are formed on the same layer.9. The OLED display of claim 8, wherein the driving connector is formedbetween the initialization voltage line and the driving voltage line.10. The OLED display of claim 1, further comprising: a gate insulatinglayer formed over the substrate; a first storage electrode formed overthe gate insulating layer and configured to function as a gate electrodeof the driving transistor; a first interlayer insulating layer coveringthe gate insulating layer and the first storage electrode; a secondstorage electrode formed over the first interlayer insulating layer andoverlapping the first storage electrode in the depth dimension of theOLED display; and a second interlayer insulating layer covering thesecond storage electrode and the first interlayer insulating layer,wherein the driving connector, the initialization voltage line, and thedriving voltage line are formed over the second interlayer insulatinglayer.
 11. The OLED display of claim 10, wherein the driving connectoris electrically connected to the first storage electrode via a contacthole passing through the second storage electrode, and wherein thedriving connector is electrically insulated from the second storageelectrode.
 12. The OLED display of claim 1, further comprising acompensation transistor configured to compensate a threshold voltage ofthe driving transistor and electrically connected to the driving drainelectrode of the driving transistor, wherein the driving connector isconfigured to electrically connect the compensation drain electrode ofthe compensation transistor to the driving gate electrode.
 13. The OLEDdisplay of claim 1, further comprising a semiconductor formed over thesubstrate and including a switching channel of the switching transistorand a driving channel of the driving transistor which are spaced apartfrom each other, wherein the driving channel overlaps the driving gateelectrode in the depth dimension of the OLED display, and wherein thedriving channel is non-linear.
 14. An organic light-emitting diode(OLED) display, comprising: a plurality of pixels; a data line formedadjacent to the pixels and configured to transfer a data voltage; adriving voltage line formed substantially parallel to the data line andconfigured to transfer a driving voltage; and an initialization voltageline formed substantially parallel to the data line and configuredtransfer an initialization voltage; wherein at least one of the pixelsincludes: a driving transistor including a driving gate electrode andconfigured to receive the initialization voltage from the initializationvoltage line; a driving connector spaced apart from the data line andelectrically connected to the driving gate electrode; and an OLEDelectrically connected to the driving transistor, wherein at least oneof the initialization voltage line and the driving voltage line isinterposed between the driving connector and the data line in a planeview, wherein the pixels includes a first pixel and a second pixelconfigured to emit light having different colors, and a third pixelformed between the first pixel and second pixel, wherein the drivingvoltage line is formed between the first and third pixels, and whereinthe initialization voltage line is formed between the second and thirdpixels.
 15. The OLED display of claim 14, wherein the data line includesfirst to third data lines substantially parallel to each other, andwherein the initialization voltage line is interposed between thedriving connector and the third data line.
 16. The OLED display of claim15, wherein the driving voltage line is interposed between the drivingconnector and the first data line.
 17. The OLED display of claim 16,wherein the driving connector, the first data line, and theinitialization voltage line are spaced apart from one another.
 18. TheOLED display of claim 17, wherein the driving connector, the third dataline, and the driving voltage line are spaced apart from one another.